How to make HTTP request to php server in Swift iOS

I am trying to make connection to PHP server using Swift but I am getting error and I don't know how to solve that.

Here is the code for register tapped button. I am making connection to php server and sending value via post to create a new user in the database.

@IBAction func registerTapped(sender: AnyObject) {
        let userId = userid.text;
        let user_password = password.text;
        let user_password_reaeat = repeatpassword.text;

        if(userId.isEmpty || user_password.isEmpty || user_password_reaeat.isEmpty)
        {
            displayMyAlertMessage("All Fields are required !!");
        }

        if(user_password != user_password_reaeat)
        {
            displayMyAlertMessage("Password didn't match !!");
        }


        let myURL = NSURL(string: "http://tech3i.com/varun/ios-api/userRegister.php");
        let request = NSMutableURLRequest(URL: myURL!);
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")
        let postString = "userid=\(userId)&password=\(user_password)";

        request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding);

        let task = NSURLSession.sharedSession().dataTaskWithRequest(request)
        {
            data, response, error in
            if(error != nil)
            {
                println("error=\(error)")
                return
            }


            var err:NSError?
            var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error: &err) as? NSDictionary

            if let parseJSON = json
            {
                var resultValue = parseJSON["status"] as? String!;
                println("result:\(resultValue)")

                var isUserRegistered:Bool = false
                if(resultValue=="Success")
                {
                    isUserRegistered = true;
                }
                var messageToDisplay = parseJSON["message"] as String!;
                if(!isUserRegistered)
                {
                    messageToDisplay = parseJSON["message"] as String!;
                }

                dispatch_async(dispatch_get_main_queue(),
                {
                    //Display Alert messsage with confirmation
                    var myAlert = UIAlertController(title: "Alert", message:messageToDisplay, preferredStyle: UIAlertControllerStyle.Alert);
                    let okAction = UIAlertAction(title: "OK", style:UIAlertActionStyle.Default)
                    {
                        action in
                        self.dismissViewControllerAnimated(true, completion:nil);
                    }
                    myAlert.addAction(okAction);
                    self.presentViewController(myAlert, animated: true, completion:nil);
                });
            }
        }
    task.resume()

    }



    func displayMyAlertMessage(userMessage:String)
    {
        var myAlert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.Alert);
        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil);
        myAlert.addAction(okAction);
        self.presentViewController(myAlert, animated: true, completion:nil);
    }

and when I tap on the register button I get the following error

error=Error Domain=NSURLErrorDomain Code=-1017 "The operation couldn’t be completed. (NSURLErrorDomain error -1017.)" UserInfo=0x79b536b0 {NSErrorFailingURLStringKey=http://tech3i.com/varun/ios-api/userRegister.php, _kCFStreamErrorCodeKey=-1, NSErrorFailingURLKey=http://tech3i.com/varun/ios-api/userRegister.php, _kCFStreamErrorDomainKey=4, NSUnderlyingError=0x799cd130 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error -1017.)"}

My PHP Script for create new user

<?php
require("Conn.php");
require("MySQLDao.php");
$email = htmlentities($_POST["userid"]);
$password = htmlentities($_POST["password"]);

$returnValue = array();

if(empty($email) || empty($password))
{
$returnValue["status"] = "error";
$returnValue["message"] = "Missing required field";
echo json_encode($returnValue);
return;
}

$dao = new MySQLDao();
$dao->openConnection();
$userDetails = $dao->getUserDetails($email);

if(!empty($userDetails))
{
$returnValue["status"] = "error";
$returnValue["message"] = "User already exists";
echo json_encode($returnValue);
return;
}

$secure_password = md5($password); // I do this, so that user password cannot be read even by me

$result = $dao->registerUser($email,$secure_password);

if($result)
{
$returnValue["status"] = "Success";
$returnValue["message"] = "User is registered";
echo json_encode($returnValue);
return;
}

$dao->closeConnection();

?>

I am following video from youtube here is the link https://www.youtube.com/playlist?list=PLdW9lrB9HDw1Okk_wpFvB6DdY5f5lTfi1 its the 6th video in the playlist User login and Register/Sign up example using Swift on iOS. Video #3